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Mise en œuvre et évaluation de dispositifs de cryptographie quantique à longueur d'onde télécom

Abstract : Quantum Key Distribution (QKD) is defined as the distribution of a common secret key between two distant parties, the unconditional security of this distribution being ensured by the laws of quantum physics and information theory. We have designed a complete QKD demonstrator, based on a protocol in which information is encoded on continuous variables of light, namely the quadratures of the electromagnetic field. The system is entirely composed of standard components from the telecommunication industry, allowing Alice to generate the required coherent states of light and to modulate them, and Bob to measure these states using a pulsed, shot-noise limited homodyne detector. Moreover, we have developed a set of software which manages the entire key distribution process: on the one hand, the quantum transmission and the feed-back controls required for a correct stability; on the other hand, the extraction of secret keys from the data shared after the transmission. The system has been integrated in rack cases, so as to perform a true-scale demonstration within a QKD network, which was deployed on standard fibers installed in Vienna (Austria). During this demonstration, our system has operated continuously for 57 hours, with an average key rate of 8 kbit/s. Finally, we have explored various possibilities of improvement for the system, through a new QKD protocol and the use of optical amplifiers.
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https://pastel.archives-ouvertes.fr/tel-00429450
Contributor : Simon Fossier <>
Submitted on : Monday, November 2, 2009 - 9:51:24 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:40 PM
Long-term archiving on: : Thursday, June 17, 2010 - 5:45:46 PM

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  • HAL Id : tel-00429450, version 1

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Simon Fossier. Mise en œuvre et évaluation de dispositifs de cryptographie quantique à longueur d'onde télécom. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00429450⟩

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